Suppose the altitude of a rising hot-air balloon is given by h = 0.04 t2 + 2t, where t is the time in seconds after the balloon leaves the ground.

8. Suppose the altitude of a rising hot-air balloon is given by h = 0.04 t2 + 2t, where t is the time in seconds after the balloon leaves the ground. How long will it take for the balloon to reach an altitude of 200 feet?